Double-crested Cormorants

Description:

Double-crested Cormorants are large waterbirds with small heads on long, kinked necks. They have thin, strongly hooked bills, roughly the length of the head. Their heavy bodies sit low in the water. Adults are brown-black with a small patch of yellow-orange skin on the face. Immatures are browner overall, palest on the neck and breast. In the breeding season, adults develop a small double crest of stringy black or white feathers.

Habitat:

These birds have perched on the row of posts that ends the part of the beach that you can drive on the wet sand toward Bolivar Flats Shorebird Sanctuary. Pedestrian traffic only beyond this point. Bolivar Flats Shorebird Sanctuary is owned by the Houston Audubon Society and one of several in the area.

Notes:

Approximately 140,000 shorebirds, representing 37 species use Bolivar Flats for both feeding and roosting. The area also serves as a year- round roost for gulls and terns; a feeding area for herons and egrets, a wintering site for the American White Pelican, and a wintering site for several species of waterfowl. The federally endangered species brown pelican and peregrine falcon are other important species using the flats for roosting and feeding. The adjacent salt marsh hosts clapper rails, seaside sparrow, and sharp-tailed sparrow. Black Skimmers and Least terns attempt to nest on the flats every year, but usually are not successful because of vehicular traffic. The huge bird population is largely supported by Bolivar Flats' rich, benthic infauna. Polychaet worms are the most abundant benthic animals. Shorebird use is highest in the winter and in early spring. Dunlin, Western Sandpipers, Short-billed Dowitcher, and American Avocet are the most abundant winter shorebirds. Willets and Wilson's Plovers nest at the site. Willets, Black-bellied Plovers, and Sanderlings occur all year. The area is also one of the most important wintering sites for the threatened Piping Plover.